fix: use HealObject for cleaning up dangling objects (#11171)

main reason is that HealObjects starts a recursive listing
for each object, this can be a really really long time on
large namespaces instead avoid recursive listing just
perform HealObject() instead at the prefix.

delete's already handle purging dangling content, we
don't need to achieve this by doing recursive listing,
this in-turn can delay crawling significantly.

cmd/data-crawler.go

@@ -611,18 +611,9 @@ func (f *folderScanner) scanQueuedLevels(ctx context.Context, folders []cachedFo
 				if f.dataUsageCrawlDebug {
 					logger.Info(color.Green("healObjects:")+" deleting dangling directory %s", prefix)
 				}
+
 				// If we have quorum, found directories, but no objects, issue heal to delete the dangling.
-				objAPI.HealObjects(ctx, bucket, prefix, madmin.HealOpts{Recursive: true, Remove: true},
+				objAPI.HealObject(ctx, bucket, prefix, "", madmin.HealOpts{Recursive: true, Remove: true})
-					func(bucket, object, versionID string) error {
-						// Wait for each heal as per crawler frequency.
-						wait()
-						wait = crawlerSleeper.Timer(ctx)
-						return bgSeq.queueHealTask(healSource{
-							bucket:    bucket,
-							object:    object,
-							versionID: versionID,
-						}, madmin.HealItemObject)
-					})
 			}
 
 			wait()